Die mount for plastic extruders



Feb. 15, 1949. H. T. TORNBERG 2,461,856 I DIE MOUNT FOR PLASTIC EXTRUDERS Filed Aug. 30, 1947 Patented Feb. .15, 1949 DIE MOUNT FOR PLA STIC EXTRUDERS Henning T. Tornberg; Ridgewood, N. J assignor v to Modern Plastic Machinery Corporation,

Lodi, N. J., a corporation of Delaware Application August 30, 1947, Serial No. 771;4'77' Claims.

' The present invention relates to plastic extrusion machines and more particularly to means for mounting extrusion dies thereon.

An object of this invention is to provide a novel and improved die mounting'means for plastic'extruders, whereby dies may be easily interchanged and properly fitted at the discharge end of such machines.

Another object hereof is to provide die mounting means of the character mentioned, of novel and improved construction, which insures a.

proper positioning of the die, a positive seal against leakage, even if the parts constituting such mounting means have their securing bolts tightened unevenly.

A further object hereof is to provide a novel and improved die-mounting means for plastic extruders, which is of simple construction, reasonably cheap to manufacture, easy to use, positive in action and efficient in carrying out the purposes for which it is designed.

Other objects and advantages will become apparent as this disclosure proceeds.

In the accompanying drawings forming part of this specification, similar characters of reference indicate corresponding parts in all the views.

Fig. 1 is a partial longitudinal sectional view of an embodiment of this invention mounted on a plastic extruder.

Fig. 2 shows the discharge end of cluded in Fig. 1.

Fig. 3 is a side view of Fig. 2.

Fig. 4 shows the front view of the collar used to effect a ball joint socket for the die.

Fig. 5' is a section taken at line 5-5 in Fig. 4. The section of said collar shown in Fig. l, is taken at line in Fig. 4.

Fig. 6 shows the front view of a split collar included in the embodiment shown in Fig. 1.

the die in- Fig. '7 is a section taken at line '|--'|'in Fig. 6.

In the drawings, the numeral l5 indicates the cylinder of a plastic extruder. The cylinder liner is Hi, and the feed screw is designated as H. The 1 The flange or collar 2 i, has the wall of its hole machinedior surface contact with such sphere, and then is provided with a number of equispaced radially extending slots 22 adapted to permit the passage of the lugs- 20 therethrough, one lug through one slot. Then the die I9 may be axially turned a bit, whereby the lugs 20 will respectively contact the respective segmental spherical surfaces of the segments 23. The' diameter of thebody of the die in the region where it is met by the convex surfaces 20' of the lugs 20, should preferably be less than the diameter of the smallestsection of the hole of collar 2 I That. is, that when the collar 2| is on the die l9, and the surfaces 2|) of the lugs are in contact with the concave surfaces 2|, said collar will be capable of some movement without disturbing such contact. This is most practical, for a good and proper joint is effected, even if the screws 24 joining the collars 2| and I8, are unevenly tightened. In assembly, the liner It, acts as a seat for the die l9. Compression coil springs 25 in sockets 26, automatically space the collars, upon loosening of screws 24. For the reception of the screws 24, the collar 2| is provided with the counterbores II, and the collar 3 with the threaded holes l2.

For any particular extruder, all dies to be used therewith shall be provided with lugs to suit the spherical surface of the hole of the collar 2|, and the dimensions and number of its slots 22.- If desired, the collar parts l8, may be an integral flange on the cylinder l5.

In use, the collar 2| is maintained always mounted on the flange made by parts it. To mount a die IS, the screws 24 are loosened, whereupon springs 25 will separate the collars they bear against. The lugs 20 of the die are passed. through the slots 22, and the die then axially turned so that the convex surfaces of said lugs be covered by the respective segments 23 of the collar 2|. The die is then held seated against the cylinders liner i6, and the screws 24 tightened. The manner of removal of the die is obvious, without removing the collar 2| from ofi the machine.

This invention is capable of numerous forms and various applications without departing from the essential features herein disclosed. It is therefore intended and desired that the embodiment shown herein be deemed illustrative and that the patent shall cover all patentable novelty herein set forth; reference being had to the following claims rather than to the specific descripon said die having such a flared bore; the surface of said bore in the collar beingdncontactwith said sloping surfaces of the lugs and provided with a plurality of channels' -extending"through the face of the collar positioned furthest from the inlet end of the die; said channels being spaced and of such dimension; and numberas to permit passage of the lugs therethrough. respectively simultaneously when the die is turned within the bore of the collar so that the lugs are alignedwith said channels respectively; the inlet end of said die. being positioned in communication with the discharge outlet of such machine and adjustable means securing the collar on such machine whereinthe die is maintained with its inlet-end in communication with the discharge outletof said machine, and upon manipulation of said means, thecollar is loosened fromits hold on; the die.

2; A combination as defined in claiml, wherein the flared bore in the collar is part of a spherical surface.-

3. A combination asdefined in'claim 1, wherein the body of the die is cylindrical in front of and to. they rear of the lugs;towards the end of the die, whereinsaid lugs are equally spaced and extend radially from the body of the die and wherein the flared bore in the collar is part of a spherical surface.

4; A combination as definedin claim -1,.wherein' the extrusion machine on its body near itsldischarge endis provided with an annular groove, and including a two-part collar positioned in said groove: andextending laterally therefrom and.

whereinthe adjustable means securing the collar 4 having the flared bore on the machine, comprises a plurality of bolts threadedly engaged and extending from the face of said two part collar; the other collar being slidably mounted on said bolts and wherein'the flared bore in the collar is part of a spherical surface, whereby said latter collar may assume a tilted relation with respect to the two-part collar upon tightening of the bolts and maintain the inlet end of the die in communication with the discharge outlet of the machine, and then upon loosening of the bolts, the. dieis freefor removal.

5; A combination as defined in claim 1, wherein the extrusion machine on its body near its discharge end is provided with an annular groove, and including a two-part collar positioned in said groove and extending laterally therefrom and wherein the adjustable means securing the collar having the flared bore on the machine, comprises a. plurality of bolts threadedly engaged and extending from theface of said two-part collar; the. other collar. being slidably mounted on said bolts and wherein theflared bore in the collar is part of a sphericalsurface, whereby said latter collar may assume a tilted relation. with respect to the two-part collar upon tightening of the bolts and, maintain the inlet end of the die in communication with the discharge outlet of the machine, and including spring means between and acting against both collars,.wherebyupon.-

loosening of the bolts, saidspring means will cause the collars to separate. thereby. freeing the die for removal.

HENNING T. TORNBERG.

REFERENCES CITED The following references are of record in the fileof this,.-patent:-

UNITED STATES PATENTS 

